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RetellAI

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RetellAI is a startup that provides an AI-powered voice agent platform, enabling businesses to build, test, and deploy conversational voice assistants for tasks like customer support and phone-based automation. It is known for offering developer-friendly APIs to create natural-sounding, low-latency voice AI applications.

5 interview notes · updated Jul 2026

RetellAI·Software Engineer·Onsite - System Design / Architecture

Jul 2026
System design round at Retellai for a software engineer role, pretty much one big question about building a collaborative doc editor. The whole session was focused on concurrency, which I was not fully prepared for at that depth.
  • Design the backend for a real-time collaborative document editor. Focus on how multiple users can edit the same document simultaneously without losing or duplicating content, and how all clients eventually converge to the same state.

“This was the whole interview basically.”

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RetellAI·Frontend Engineer·Technical Phone Screen

May 2026
Short technical screen for a frontend role at RetellAI. Just one question that I remember but it was a good signal about how they think about UI performance.
  • If you're building a search bar, how would you avoid firing a request on every single keystroke?

“Pretty classic frontend question but I second-guessed myself mid-answer.”

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RetellAI·Software Engineer·Onsite - System Design / Architecture

May 2026
RetellAI software engineering interview with a system design question that had a fairness angle I wasn't really prepared for. Decent question, made me think harder than I expected.
  • Design a scheduling system that assigns tasks to workers or workers to shifts. Beyond just making it work, the schedule needs to be 'fair': balanced workload, no one repeatedly stuck with the worst slots, no consecutive overnight shifts, etc. Define what fairness means, propose an algorithm, and walk through the trade-offs compared to a pure greedy approach or a full optimization solver.

“The fairness definition part tripped me up first.”

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RetellAI·Frontend Engineer·Technical Phone Screen

Apr 2026
Interviewed for a frontend role at RetellAI and got asked about React hooks. Pretty standard technical screen, nothing too wild.
  • What are React hooks and when would you use them?

“Classic question but I still fumbled the 'when to use them' part a bit.”

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RetellAI·Frontend Engineer·Technical Phone Screen

Apr 2026
Short technical screen for a frontend role at RetellAI, just one question about the Virtual DOM.
  • Can you explain what the Virtual DOM is?

“Classic React fundamentals question.”

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